Variations of dissolved iron in the Amur River during an extreme flood event in 2013

Yan, Baixing; Guan, Jiunian; Шестеркин, В. П.; Zhu, Huiling

doi:10.1007/s11769-016-0828-8

Cited by 10 publications

(6 citation statements)

References 47 publications

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“…Such dFe addition from the cropland was also observed in many other study areas, like the Krishna river drainage area (Kannan, 1984), the Palar and Cheyyar river basin (Rajmohan and Elango, 2005), and the Guadalquivir River (Lorite-Herrera and Jimé nez-Espinosa, 2008). Eventually, the terrestrial -borne dFe injected into the Rajang River via hydrological connections in the riparian ditches, and hence contributed quantities of dFe to rivers from terrestrial runoff and flood discharges (Yan et al, 2016).…”

Section: Seasonal Variation Of Dfe In the Rajang Freshwatermentioning

confidence: 99%

Distribution and Flux of Dissolved Iron of the Rajang and Blackwater Rivers at Sarawak, Borneo

Zhang

Müller

Jiang

et al. 2019

Preprint

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Abstract. Dissolved iron (dFe) is essential for biogeochemical reactions in oceans, such as photosynthesis, respiration and nitrogen fixation. Currently, large uncertainties remain on riverine dFe inputs, especially for tropical rivers in Southeast Asia. In the present study, dFe concentrations and distribution along the salinity gradient in the Rajang River in Malaysia, and three blackwater rivers draining from peatlands, including the Maludam River, the Sebuyau River, and the Simunjan River, were determined. In the Rajang River, the concentration of dFe in fresh water (salinity&#8201;<&#8201;1) in the wet season (March 2017) was higher than that in the dry season (Auguest 2016), which might be related to the resuspension of sediment particles and soil erosions from cropland in the watershed. In the Rajang Estuary, an intensive removal of dFe in low salinity waters (salinity&#8201;<&#8201;15) was observed, likely due to the salt-induced flocculation and the absorption onto suspended particulate matters (SPM). However, dFe concentration enhancements in the wet season occured in some sampling sites, which may be related to the desorption from SPM and agriculture activities. On the other hand, dFe was conservatively distributed in high salinity waters (salinity&#8201;>&#8201;15), which may result from the association between dFe and pelagic organic matters. In the blackwater rivers, concentrations of dFe reached 44.2&#8201;&#956;mol&#8201;L&#8722;1, indicating a great contribution from peatland. The dFe flux derived from the Rajang Estuary to the South China Sea was (6.4&#8201;&#177;&#8201;2.3)&#8201;&#215;&#8201;105&#8201;kg&#8201;yr&#8722;1. For the blackwater river, the dFe flux was approximately (1.1&#8201;&#177;&#8201;0.5)&#8201;&#215;&#8201;105&#8201;kg&#8201;yr&#8722;1, in the Maludam River. The anthropogenic activities may play an important role in the dFe yield, such as the Serendeng tributary of the Rajang River, and Simunjan River, where intensive oil palm plantations were observed.

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Section: Seasonal Variation Of Dfe In the Rajang Freshwatermentioning

confidence: 99%

Distribution and Flux of Dissolved Iron of the Rajang and Blackwater Rivers at Sarawak, Borneo

Zhang

Müller

Jiang

et al. 2019

Preprint

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“…Since the 1990s, most paddy fields rely on underground water for irrigation in the Sanjiang Plain (Pan et al, 2010). A significant amount of iron accumulates in the profile of paddy fields irrigated with soluble iron‐high groundwater (Yan et al, 2016). In addition, the decreasing solubility and migration of soil iron during soil tillage would contribute significantly to the increase in soil Fe t after wetland conversion.…”

Section: Discussionmentioning

confidence: 99%

“…Many of these studies focused on the limitations of high‐nutrient and low‐chlorophyll (HNLC) waters, which account for approximately 40% of the oceans' surface (Janssen et al, 2020; Nielsdóttir et al, 2012; Sanders et al, 2015). In riparian zones, iron transported by rivers plays a crucial role in the dynamics of plankton blooms in the ocean (Yan et al, 2016). This, in turn, may impact the biogeochemical processes of carbon, nitrogen, sulfur, and silicon and could ultimately affect the global climate system (Chi et al, 2015; Nishioka et al, 2014; Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Many in situ experiments have confirmed that the subArctic North Pacific is an HNLC region (Güssow et al, 2010; Nishioka & Obata, 2017; Schallenberg et al, 2015). Nevertheless, as the northernmost sea of the marginal seas of the Pacific Ocean, the Sea of Okhotsk has not experienced iron limitations and is characterized by high phytoplankton productivity (Yan et al, 2016). This might be due to the iron supplied by the Amur River, which is 4350 km long and covers a region of 2.1 million km 2 (Chi et al, 2016; Yoshimura et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal dynamics in soil iron affected by wetland conversion on the Sanjiang Plain

et al. 2021

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Since the 1950s, nearly 80% of wetlands in the Sanjiang Plain have been converted into paddy fields. The conversion might affect the solubility and mobility of soil iron, influencing the export of iron into the Amur River and the primary production of the Okhotsk Sea. However, information regarding long-term studies of the spatiotemporal dynamics of soil iron after cultivation is limited. In this study, six regions, including 18 plots in the Sanjiang Plain, were selected as sampling sites covering natural wetlands and paddy fields with planting ages of 2, 5, 11, 18, and 25 years after conversion from the wetland. Samples were collected at six different depths (0-10, 10-20, 20-40, 40-60, 60-90, and 90-120 cm) analyzed for water-soluble ferrous iron (Fe [II]), water-soluble iron (Fe w ), complex iron (Fe p ), amorphous iron oxides (Fe o ), free iron oxides (Fe d ), and total iron (Fe t ) and six soil physicochemical characteristics. Two years after the conversion of wetlands to rice fields led to an immediate decrease in Fe(II), Fe w , Fe p /Fe d , and Fe o /Fe d , while the Fe p and Fe o contents decreased at 5 years. Both the concentrations and stocks of soil Fe t increased gradually during the

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“…The addition of dFe from cropland was also observed in many other study cases, such as the Krishna River drainage area (Kannan, 1984), the Palar and Cheyyār River basins (Rajmohan and Elango, 2005), and the Guadalquivir River (Lorite-Herrera and Jiménez-Espinosa, 2008). Eventually, stream-borne dFe was injected into the Rajang River via hydrological connections in the riparian ditches, causing dFe to be distributed to rivers from terrestrial runoff and flood discharges (Yan et al, 2016).…”

Section: Seasonal and Spatial Variation In Dfe In The Rajang Rivermentioning

confidence: 99%

Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo

et al. 2020

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Abstract. Dissolved iron (dFe) is essential for multiple biogeochemical reactions in oceans, such as photosynthesis, respiration and nitrogen fixation. Currently, large uncertainties remain regarding the input of riverine dFe into coastal oceans, especially in tropical rivers in southeastern Asia. In the present study, the concentrations of dFe and distribution patterns of dFe were determined along the salinity gradient in the Rajang River and three blackwater rivers that drain from peatlands, including the Maludam River, the Sebuyau River and the Simunjan River. In the Rajang River, the dFe concentration in freshwater samples (salinity <1 PSU – practical salinity units) in the wet season (March 2017) was higher than that in the dry season (August 2016), which might be related to the resuspension of sediment particles and soil erosion from cropland. In the Rajang estuary, an intense removal of dFe in low-salinity waters (salinity <15 PSU) was observed, which was likely due to salt-induced flocculation and absorption of dFe onto suspended particulate matter (SPM). However, increases in the dFe concentration in the wet season were also found, which may be related to dFe desorption from SPM and the influences of agricultural activities. In the blackwater rivers, the dFe concentration reached 44.2 µmol L−1, indicating a strong contribution to the dFe budget from peatland leaching. The dFe flux derived from the Rajang estuary to the South China Sea was estimated to be 6.4±2.3×105 kg yr−1. For blackwater rivers, the dFe flux was approximately 1.1±0.5×105 kg yr−1 in the Maludam River. Anthropogenic activities may play an important role in the dFe yield, such as in the Serendeng tributary of the Rajang River and Simunjan River, where intensive oil palm plantations were observed.

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Variations of dissolved iron in the Amur River during an extreme flood event in 2013

Cited by 10 publications

References 47 publications

Distribution and Flux of Dissolved Iron of the Rajang and Blackwater Rivers at Sarawak, Borneo

Distribution and Flux of Dissolved Iron of the Rajang and Blackwater Rivers at Sarawak, Borneo

Spatiotemporal dynamics in soil iron affected by wetland conversion on the Sanjiang Plain

Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo

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